<template>
  <div>
    <!--面包屑导航-->
    <Breadcrumb>
      <template #firstTitle>
        <span>商品管理</span>
      </template>
      <template #secondTitle>
        <span>添加商品</span>
      </template>
    </Breadcrumb>

    <!--卡片视图-->
    <el-card>
      <!--提示文字-->
      <el-alert
        title="添加商品信息"
        type="info"
        :closable="false"
        center
        show-icon>
      </el-alert>

      <!--步骤条-->
      <el-steps :space="300" align-center :active="activeIndex - 0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!--tab标签-->
      <el-form
        status-icon
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top">
        <el-tabs
          v-model="activeIndex"
          tab-position="left"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="cateChange"
                clearable></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的item项-->
            <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
              <!--复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  v-for="(item2, index2) in item.attr_vals"
                  :key="index2 + item2"
                  :label="item2"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品属性" name="2">
            <el-form-item v-for="item in onlyTableData" :key="item.attr_id" :label="item.attr_name">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadURL"
              :headers="headersObj"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>

          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器组件-->
            <quill-editor
              ref="myQuillEditor"
              v-model="addForm.goods_introduce"
            />
            <!--添加商品按钮-->
            <el-button type="primary" class="btn-add" @click="addGoods">添加</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!--图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="preview-img">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'
  import Breadcrumb from '@/components/common/Breadcrumb.vue'

  export default {
    name: "AddGoods",
    data() {
      return {
        activeIndex: '0',
        addForm: {  //添加商品数据
          goods_name: '', //商品名称
          goods_price: '',  //商品价格
          goods_weight: '',  //商品重量
          goods_number: '',  //商品数量
          goods_cat: [],  //商品分类
          pics: [],  //商品图片
          goods_introduce: '',  //商品内容描述
          attrs: []
        },
        addFormRules: { //添加商品表单的校验规则
          goods_name: [
            {required: true, message: '请输入商品名称', trigger: 'blur'}
          ],
          goods_price: [
            {required: true, message: '请输入商品价格', trigger: 'blur'}
          ],
          goods_weight: [
            {required: true, message: '请输入商品重量', trigger: 'blur'}
          ],
          goods_number: [
            {required: true, message: '请输入商品数量', trigger: 'blur'}
          ],
          goods_cat: [
            {required: true, message: '请选择商品分类', trigger: 'change'}
          ]
        },
        cateList: [], //商品分类列表
        cateProps: {  //指定级联选择器的配置对象
          expandTrigger: 'hover',
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        manyTableData: [],  //商品参数
        onlyTableData: [],  //商品属性
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload', //上传图片的URL地址
        headersObj: { //图片上传组件的headers请求头
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: '',  //预览图片路径
        previewVisible: false,  //预览图片显示/隐藏
      }
    },
    components: {
      Breadcrumb
    },
    computed: {
      // 当前选中的分类ID
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2];
        } else {
          return '';
        }
      },
    },
    created() {
      this.getCateList();
    },
    methods: {
      // 获取商品分类
      async getCateList() {
        const {data: res} = await this.$http.get('categories');
        // console.log(res);
        if (res.meta.status !== 200) {
          this.$message.error(`获取商品分类数据: ${res.meta.msg}`);
          return;
        }
        this.cateList = res.data;
      },
      // 选择商品分类
      cateChange() {
        if (this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = [];
          return;
        }
        // this.getParamsData();
      },
      // tab切换标签之前的钩子，若返回 false 或者返回 Promise 且被 reject，则阻止切换。
      beforeTabLeave(activeName, oldActiveName) {
        if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error(`请先选择商品分类！`);
          return false;
        }
      },
      // tab 被选中时触发
      async tabClicked() {
        if (this.activeIndex === '1') {
          //获取商品参数
          this.getParamsData('many');
        }else if (this.activeIndex === '2') {
          //获取商品属性
          this.getParamsData('only');
        }
      },
      // 获取参数列表数据
      async getParamsData(type){
        // 根据所选分类ID和当前所处的面板获取对应的参数
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: type}});
        // console.log(res);
        if (res.meta.status !== 200) {
          this.$message.error(`获取参数列表: ${res.meta.msg}`);
          return;
        }

        if (type === 'many'){
          res.data.forEach((item) => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
          });
          this.manyTableData = res.data;
        } else {
          this.onlyTableData = res.data;
        }
      },
      // 处理图片移除操作
      handleRemove(file, fileList) {
        // console.log(file, fileList);
        // 1.获取将要删除的图片临时路径
        const filePath = file.response.data.tmp_path;
        // 2.从pics数组中找到这个图片对应的索引值
        const index = this.addForm.pics.findIndex( x => x.pic === filePath);
        // 3.调用数组的splice方法，把图片信息对象从pics数组中移除
        this.addForm.pics.splice(index, 1);
        // console.log(this.addForm);
      },
      // 处理图片预览效果
      handlePreview(file) {
        console.log(file);
        this.previewPath = file.response.data.url;
        this.previewVisible = true;
      },
      // 文件上传成功时的钩子
      handleSuccess(response){
        // 1.拼接得到一个图片信息对象
        const picInfo = {
          pic: response.data.tmp_path
        };
        // 2.将图片信息对象push到pics数组中
        this.addForm.pics.push(picInfo);
        // console.log(this.addForm);
      },
      // 添加商品
      async addGoods(){
        console.log(this.addForm);
        this.$refs.addFormRef.validate(async (valid) => {
          if (!valid) {
            this.$message.error('请填写必要的表单项');
            return;
          }
          // 执行添加的业务逻辑（先深拷贝，再调整数据结构）
          // 处理动态参数
          this.manyTableData.forEach((item) => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            };
            this.addForm.attrs.push(newInfo);
          });
          // 处理静态属性
          this.onlyTableData.forEach((item) => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            };
            this.addForm.attrs.push(newInfo);
          });
          //深拷贝
          const form = _.cloneDeep(this.addForm);
          form.goods_cat = form.goods_cat.join(',');

          console.log(form);
          // 发起添加商品请求
          const {data: res} = await this.$http.post(`goods`, form);
          // console.log(res);
          if (res.meta.status !== 201) {
            this.$message.error('添加商品失败');
            return;
          }
          this.$message.success('添加成功');
          this.$refs.addFormRef.resetFields();
          this.$router.push('/goods');
        });
      }
    }
  }
</script>

<style scoped>
  .el-checkbox{
    margin: 0 10px 0 0 !important;
  }
  .preview-img{
    width: 100%;
  }
  .btn-add{
    margin-top: 15px;
  }
</style>
